If you want to be a writer, write.
Someone told me yesterday she isn’t a writer, but she loves to write.
Do you know how ridiculous that sounds?
If you love to write and you write, you’re a writer.
End of story.
Being a writer has nothing to do with having a specific professional occupation.
Yes, there are paid writers, but they are often no better than regular joes who decide one day to pick up a pen and write. Sometimes regular joes become famous.